Don't relayout reader views with delay

For some reason, Core Text was giving infinite height to the line
containing the placeholder for a youtube video.

Setting a longer delay also fixed it, but since everything else seems to
work I removed the relayout code.

Fixes #655 for 3.8.6
Revert "Don't relayout reader views with delay"

This reverts commit e85ee60953b66d8d0d2b9733734b584d44f7277a.
Fixes a divide by zero error when laying out videos in the reader detail.
Merge pull request #866 from wordpress-mobile/release/3.8.6-fix-video-crash

Release/3.8.6 fix video crash
Bumping to version 3.8.6
Merge pull request #973 from wordpress-mobile/release/3.8.6

Merging release/3.8.6 into master